* Added an atomic.h header that provides a C++ file with a templatized

64-bit safe version of atomic_test_and_set() for pointers:
  atomic_pointer_test_and_set().
* The VFS is now using this function (it's not used anywhere else in the
  kernel this way).


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@25260 a95241bf-73f2-0310-859d-f6bbb57e9c96

headers/private/kernel/util/atomic.h

@@ -0,0 +1,31 @@
+/*
+ * Copyright 2008, Axel Dörfler, [email protected].
+ * Distributed under the terms of the MIT License.
+ */
+#ifndef _KERNEL_UTIL_ATOMIC_H
+#define _KERNEL_UTIL_ATOMIC_H
+
+
+#include <limits.h>
+
+#include <SupportDefs.h>
+
+
+#ifdef __cplusplus
+
+template<typename PointerType> PointerType*
+atomic_pointer_test_and_set(PointerType** _pointer, PointerType* set,
+	PointerType* test)
+{
+#if LONG_MAX == INT_MAX
+	return (PointerType*)atomic_test_and_set((vint32*)_pointer, (int32)set,
+		(int32)test);
+#else
+	return (PointerType*)atomic_test_and_set64((vint64*)_pointer, (int64)set,
+		(int64)test);
+#endif
+}
+
+#endif	// __cplusplus
+
+#endif	/* _KERNEL_UTIL_ATOMIC_H */